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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for March 10, 2005
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1998 Buick Park Avenue Ultra 3.8L abs light VIN: 1G4CU5211W
Measured resistance of harness from sensor to ebtcm... .003 ohms. will be fine for up to 2 weeks then the fault will reoccur in the form of stored DTC's and false abs and traction control events.
2000 Buick LeSabre Custom 3.8L warning systems VIN: 1G4HP54K1Y
Car came in with complaint that after driving 10-15 minutes dash warning lites would illuminate randomly and power door locks would become inoperative. Verified complaint and pulled codes u1016 u1040 u1064 u1096 from airbag system. Also had p1626 in pcm. After...
1996 Cadillac DeVille Concours 4.6L monitors not set VIN: 1G6KF5294T
This 96 Deville came in for being rejected at the test lane for having more than two monitor's in the "Not Ready" status. It had "cat efficiency status, Heated O2 sensor system, and O2 sensor status all not ready. As it had a history code for the heater circui... Trouble codes: P0135
1988 Chevrolet Celebrity 2.5L No Start VIN: 1G1AW51R2J
vehicle will start fine cold warm up may start may not . crank vehicle when hot will not start let off keyback to off pos. then recrank check eng. lite will flash once car will start. may run fine all day then may take a spell and repeat same problem. cant bel...
1989 Chevrolet Astro CL 4.3L Stall, Misfire, Poor Fuel Economy, Back firing VIN: 1GNDM15Z2K
Hi Guys! Why me? This van has been in our shop before several months ago and after replacing the O2 sensor & knock sensor it ran fine. The customer states now that for the past couple of weeks it will stall out while going down the highway. When she tries to... Trouble codes: 42 (EST error), 43 (ESC failure), 33 (map), 32 (egr)
1989 Chevrolet Celebrity 2.8L Cuts out, Stall VIN: 3G1AW51W4K
This vehicle came in with an obvious problem at cruise when under load. The engine suddenly shuts off with the gas pedal to the floor at 4000 +-500 RPM but restarts immediately afterwards. Sometimes however, after extensive power braking to get symptoms to app...
1994 Chevrolet Camaro Z28 5.7L Starting VIN: 2G1FP22P1R
Thanks in advance for any help. This camaro has no power to the starter, it has the security light on. Last week we tested the ign switch, clutch switch, both are powering up. The theft deterant module was not allowing power through so we replaced the module ...
1997 Chevrolet K1500 5.7L blown #20 fuse VIN: 1GBEK19RXV
hi, i was told vehicle was blowing #20 fuse ,dash and trans would quit working. dealer replaced mlps switch and plugs per code and bulletin. fuse kept blowing so i got it. plug has at least 2 wires switched in wrong places because rev lights were on all the ti...
1997 Chevrolet C3500 5.7L heater blower motor resitor VIN: 1GBJC34R7V
Hello iATN members.I was just wondering if anyone has run across this problem before. Customer complains of only hi speed blower no low M1 M2. The blower motor resistor keeps blowing on this truck every couple of months.Another shop has replaced it once and we...
1997 Chevrolet P30 7.4L No communication VIN: 1BCCS14N5T
HI,The problem is no communication with the VCM,Intermittently the motor home goes into Limp-in may once in 2 weeks or twice in 6 months,when it happens the owner says there was a harsh downshift and transmission didn't want to shift,he pulled over and removed... Trouble codes: 24 (vss), 27 (egr)
1998 Chevrolet K2500 Cheyenne 7.4L No Start VIN: 1GCGK29J5W
This personal truck of mine has me ready to trade it in, it starts good cold but after you run it for a while and let it sit for 15 min- 1hr it will crank for 20 sec or more before it starts. I have injector pulse, good spark, and good fuel pressure,I noticed ...
1998 Chevrolet Cavalier LS 2.4L Poor Idle Quality VIN: 1G1JF52T7W
Fellow Techs, Help. This Quad 4 has a lope at idle and at low rpm. Misfire data shows random misfires, not on only one cylinder. Otherwise engine runs good. I have 2 of these with the same symptoms. No clues from scanner. Thank you,
1999 Chevrolet K3500 7.4L Hesitation, sever hesitation VIN: 1GVKC34J9X
this truck falls flat on its face when you pull away from a stop.idels fine,revs up fine.acts like carb model with lean choke/no accelorator pump.no codes,data has no strange things showing up.injector on time will rise to 50ms on loading,
2001 Chevrolet Malibu 3.1L Poor Idle Quality VIN: 1G1ND523X1
Hello,this car is driving me nuts.It will start and run fine for about 30 sec,then it will start hunting for idle and then stall.The strange thing is cannot get computer to set a code.Diconnected the iac,tps egr,maf all at same time and nothing.Car ran the sam...
2002 Chevrolet Venture LS 3.4L Passenger side rear electric door VIN: 1GNDX03E12
I have my niece's van here that is trying to eat my lunch. The original motor in the passengers side rear door went bad, or so I thought. It opened fine, but when she closed it, the door just started going back and forth and wouldn't shut. She got someone to d...
1995 Oldsmobile Silhouette 3.8L steerig wheel radio controls
the bulbs have white plastic base , round 10mm dia. blue bulb, the assy, locks in like an instrument light.
1950 Other GM champion 245CID turn signal & park lamps
We are in the process of a complete restoration , the wires on this thing are falling apart , all the wires look the same , the park lights and turn signals are inop(head lights do work ) ...I see a circuit breaker on the back of the head light switch( GOOD )a...
1992 Pontiac Grand Am SE 3.3L Hesitation VIN: 1G2NE54NXN
this 92 grand am has been in the shop several times for the same reason. hesitation on accel. customer replaced own t.p.s, we checked that it is ok. we have replaced ign. module and coils with known good parts, ecm power + grounds ok, has new crank sensor, als...
2001 Pontiac Grand Prix SE 3.1L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1G2WK52J31
Hello all, well this one makes little to no sense! came to us after many people have taken a wack at it. at this point in time we have only one code and one problem. p0302 missfire cyl 3. this only happens at idle. off idle this missfire goes away, and car ru... Trouble codes: P0303 (cylinder 3 missfire)
2001 Saturn L300 3.0L MIL Lamp on VIN: 1G8JW52R41
The code we get is p1780. The Snap On scanner says that the code is set when the TCM signals to the ECM to set the code. When we checked Mitchell it says "Torque Reduction Signal" We checked all of our work and do not see any loose connections or unplug sensor... Trouble codes: 1780 (ecm received signal from tcm to set code), 1780 (ecm received signal from tcm to set code)

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick Park Avenue 3.8L fuel guage VIN: 1G4CW52K3W
The general consensus is that a voltage spike, possibly from battery being disconnected and reconnected, caused the dash to put B+ to a 5 volt reference circuit. Some people suggested replacing dash, most just move the needle back and seems most keep on workin...
2004 Cadillac CTS 3.6L cant get the key out VIN: 1G6DM57764
Hello all, As many of you had replied the fix was the ECM. We installed a new programmed ECM and none of the codes returned. The ignition lock cylinder would turn to the lock position and the key is now removable. Looks like the ECM could receive messages bu...
1995 Chevrolet Blazer 4.3L 4 wheel drive not wo VIN: 1GNDT13WXS
we found a corroded connector at the transfer case motor. we cleaned it up and put everything back together. car is working fine. thanks for all the replies and help.
2002 Chevrolet Silverado 3500 6.6L Odometer, PRNDL,tow/haul VIN: 1GCJK33102
IATN saves me again. The trans range switch was the culprit. Strange how the trans shifted fine. Thanks for the replies. The ones with a part number were especially helpful. Thanks again!!
1998 GMC Sonoma SLE 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GTCS194XW
We received 16 replies on this one. All good, all helpful and well thought out. Thank you all. It was the timing chain. It had skipped three teeth and the tensionier was broken. There is a GM service bulletin on this problem, its #87-61-21A. You can find a goo... Trouble codes: P0107 (map volts low), P0108 (map volts high), P0300 (mis fire).
1999 GMC Yukon Denali 5.7L Driveline VIN: 1GKEK13R4X
Thanks to all 10 of you that responded. The most important info I received was from Andrew from Ontario and Andrew from Utah. They said basicly that the transfer case could not be bad because the output of the transmission is mechanicly linked to the rear driv...
1991 Pontiac Bonneville LE 3.8L Cuts out, Misfire VIN: 1G2HX54C0M
Hello evryone and thanks so much for the input. Of the sixteen replies eight of them were specific about the Magnavox coil pack being weak. Also a few said to check the fuel pressure regulator and for fuel volume a couple said to check the plugs and wires a co...
2002 Saturn L300 3.0L MIL Lamp on VIN: 1G8JW54R02
i found a fuse labeled ign/no in underhood fuse block which was blown.i was not able to access trouble codes WITH MT2500 but was able to clear bcm after this and light did not come back on.
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